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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd779a7e314cf14b16d4d2ec18c2162f3a0473957f132c16a2a4f2ffd7da20b53' 
  AND token = 'AYtljeK9IdYu0acZjMgM47bvBeqITlPINh1ye/RWxRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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