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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '53311416641a1cdccadb69db23b9173fd55d1401985c2607c03dd987855bc1bd' 
  AND token = '0u17/syHNRv/3yaShHSkQ1YrVFUxcGPUY4E6NAfmovk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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