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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '231981bb66987b6291b3675050d510ccd7fa7394a8021e60103c6f7b538a860a' 
  AND token = 'xWB+BHWX4e4SPUG3V1sm/dwSE/6ptmWAl9lJ3JWgaW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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