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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '37b9c5e9e2c9780037fcc144af57a7c0c3172b6187689a0c7964f81d2e5f8c2d' 
  AND token = 'wBphF8lXnbx93cHYzZk6p3n446TscF49g1ugYgc+KD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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