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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7bcfc2036c0485eaab014f759391f525bdbe7303e560c07260f5b8afdc0807db' 
  AND token = 'DBrZ96oxL07WSX6OCojTWm2MyuSbhODpVNPv8By/r+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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