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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '85512d8515070a126128a7ba94f996acdd49820307fd0e8ef8a19dffefc290e6' 
  AND token = 'DfF7x4ugTWSaZiOoyCOuRFvMAQNZNmJYTnXWCx+8kD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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