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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4e53f9c92752c6e66e5f74e609a907827f24c509c672d832b927f2b9c0386601' 
  AND token = 'QHl4MRwLVdEjLy2tQye6az8kT0OCnCXx2U4J2/q+sEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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