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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bb0643d065e25c7421f0415eaf115b1371fd1e09a772435b057855f858f980a8' 
  AND token = 'wQIJDSdXlwFN0HINx34nyV1/1dLg/ia3Bpno1GmyVFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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