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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4b8e501bf352805cc5738336a4b2cdef5e6084800e52f6c02ebbe1f32be1005d' 
  AND token = 'uGaYsBLJUKS8BupWLgdFiVwiFN1Lng08NoEWga3HoJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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