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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aa8b949fcbe7ca7944ad6d7bb9f4e395bf071a7224f787451d433d0c885ecec8' 
  AND token = 'LZchOb790Q+8gl1sNgy8m3qzi7rbBSr0oYErfBiqmek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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