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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '45d2a26b9dd4230c89076e81ed0e5adddf0a24ffe23a4f0c34a0832ef5958cd4' 
  AND token = 'MsObCNXil2FCej7gLgr0sR+9UkKsQWdrDGF21FoB+GE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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