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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '23aadbd12769e8404a93173ffc08415ab885097d4c29f7a8080d0b810526bd7f' 
  AND token = 'GT9bbLQsf+/v1LbsHZFiyR761bIUdrsSgA56klM4E+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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