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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '624d90849f0f5aca4de076c51ce8b0176c3703f77d37cf0dc21c4b0e86c074d9' 
  AND token = 'hmpz4GlpVi7sVdyX2Nv2eH986huy37nh2trIb7+HMvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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