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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '30e1b17af64731c072b53c119fb4023ca0fa2b5586d51e7f5d5026a1abab14da' 
  AND token = 'psLGazB6Zn34a5wYMikgM0Ho+p7zBr4FowSFfWnl5U8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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