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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ab9d0b4301e1ce191e536aaa7957c5f4420b1865649818dd23aa428a9ff546d5' 
  AND token = 'iX+7hJ4oGC1oCUe1JkGlSh7uLpXtNOP38bgbjvJxxs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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