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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f5419ea36333e0d224d81c7c5f4c4e25ec488230e4494b403a1ac002decf0550' 
  AND token = 'ZkczycNaBlwuMCeMDORsA6M6ooJ1pnw0OrSUHarTLgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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