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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b9f3b6af8c2d73d908d6f7e5854cb4e8cdb3a013eebbcf01bc1fbef1feff4eb1' 
  AND token = '+BFxexKC+dN47DktNCHzc1U2r8ZdymTdf/2vzs83DxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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