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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b2053d6ba0fa92508bbc634c6de0d4242f084419e795604cdabfa161f70918de' 
  AND token = 've0KSvGDn2vzmL1FA3I9XWzPdTmUc0LVUD6cHRmJJDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}