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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '473f89e502355d9d0ce95ee05a8b3aa0ff2b6cf9cedd8c77a3dbaeedf6a2de69' 
  AND token = 'GkUW2E3zFKokZjq+i9z9+u66yrQSFPS1VzCgMx16Dhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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