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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '288c14dc0f38088ce931f43c5334c5f072bc4ee92d6ecd453d2963c0bfe8aae8' 
  AND token = '2Aijq5dGKUorAfmBmPgOmlkjTyGhvWRAIZlQfj8G/Ag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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