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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a6fc3b1832106152f246885bff57aec33721f6b68087424c1bd5c882541ca036' 
  AND token = 'yBEko1R0tP47mnouY0ZKaBuFEnp50mpr+CpkE7R0Q68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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