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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c6146b3f4a8c66cb66436d19dcdcc29f4433ae65cd1102c54bb6171be0cb9e61' 
  AND token = 'Ke88ubjq+nWxvFgTZEIodrDKid5uMPfGk148HQxS3Ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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