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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bfaff13917700699c2148b7780bad09a132d47197645e0c6b4be1e327075b35c' 
  AND token = 'K2LEB7VGEweyLSSl1Q9sdb5p526oR1UDOMRdkukgTJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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