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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bb55d04ee7a21e3dfd1a0d870d4303cbe69426abed2b9ef57c20deb30ab00c9a' 
  AND token = 'nyByC8Q4syR/QdFPzGi4w9Cq2i3A7y2pepRwYvmjTvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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