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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '94445adab584bc86fc3657c13a73286ce7962df926cfcdd519f8ae607c0f46e7' 
  AND token = 'l7c5+yM5BpEHXQzKijKbAt+7cwrYZ2j8DeBHsAOKSLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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