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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '948e74d1024842cde17c7a62da15080db33a0df808d3e05613935b32bff0f0b5' 
  AND token = 'KO/iORrRNEJELUjuetEPtriu70G8ojFMi0b66VOZPm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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