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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e18b22d27b1a0684231dfc896260c5845253ab4cb9261133c49a7ac604aa5202' 
  AND token = 'j6euh2UsvrZyYVMEHQw5eX0T9plkK24oGG9ClB2edLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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