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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0c7ea1d780cc50f139d237c24003bde239f1ae8dffefd0bff05b7b1c73d44bca' 
  AND token = 'n7pkMl2cHt2Byl/6G5XvG5CtWV2afRgZM+3lwTSzpcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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