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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9295ba033d5653868f6393c2ae4a9a53983178385926426e6f2b990dc502699c' 
  AND token = 'o5iU6qaQDgmrZfH72ffigb01/n2d6j1g+ydtahjNlJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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