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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a8e0ce24b530bf85be799784c90095209d7521f4f927a115522a1370b6f993bf' 
  AND token = '/FcK79BW8mWIdxvfL+R9gT2JcG44o0iubDJ3vDW0R4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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