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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e6e97138405b47daa9f72f801badbde132a7aa90fff16a78310c75a10be429b3' 
  AND token = 'mRBdLEXy70RNZ9ygSFBbiQdgLPYuDb/e3NIX4AB6I08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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