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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '27d99f877c116f9aea3a8001bb53d2b8ac58f9c410fa21bdcb6c33125db72bca' 
  AND token = 'GlQvPCV5nwKln6dfvo9nNF09d8H+Ds6sS44wG0V8Tr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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