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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a89f06704ed1cd4b34574a74cd85df6584f111284533caa46c4a06391407edb4' 
  AND token = 'fN72HTP0pDBolU3tezFL+bBwdYZ62Qd1MlGBRAozSFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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