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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '389edcbdd2bc8b7e6d17740396aa688ae60c5a21ec11c1b47ab7c33552e181ff' 
  AND token = 'NTXz1rdtpPoGlSPmo+pmHRBHOuSYcFfMwlucxxw3i/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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