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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5e9f34b2ac768ed5fc2315a1e725ad242a976cd6aa300f28530e934f5f8f5c09' 
  AND token = 'yYV2r2zpG2cOf71WglDSdAvR+UnLXkKA52bxnTjPb9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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