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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd87e1e53e9f4777539684414f330c7b267b10a0437795aeca1450a3d947f678f' 
  AND token = 'YclAk4fhmO5qmYFcQIxC5OBgKbZ10h/D0Potnfgb3QA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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