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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '63d08abae4435fece443d7f19571755d821bfe4e0aab85347fc01d2c340aff2a' 
  AND token = 'amVLVEi0d/kA6C2gNEb8qcz6w8Pc8qfYUgTrkmQgF3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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