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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7eb2a0d0ce230efc5e2b573dd6ab7e7c7f0aad774cd22cbd1a952c3005a4187c' 
  AND token = 'T3MJUHhgS/dHtkwB/c0pKvHK7/MP5b2u0IzcRELD5L0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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